fiber_pool: take Fibers from larger pools fasterHEADmaster

Array#pop can be significantly faster than Array#shift on large
arrays (especially since we push into the Array).  This is
because Array#shift needs to shift all elements in the array,
and Array#pop only needs to shorten the array by one element.
The Fiber stack may also be hotter in CPU caches when we choose
the most-frequently used stack.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/rainbows/fiber_pool.rb b/lib/rainbows/fiber_pool.rb
index 64a638c..07a9faf 100644
--- a/lib/rainbows/fiber_pool.rb
+++ b/lib/rainbows/fiber_pool.rb
@@ -30,7 +30,7 @@ module Rainbows::FiberPool
 
     begin
       schedule do |l|
-        fib = pool.shift or break # let another worker process take it
+        fib = pool.pop or break # let another worker process take it
         if io = l.kgio_tryaccept
           fib.resume(io)
         else